Another Duggar baby is on the way.

Josh Duggar, the eldest child of Michelle and Jim Bob Duggar, and his wife Anna are expecting his fourth child together, People Magazine reported.

"I'm nine weeks pregnant, and having a lot of morning sickness," Anna said in a promotional video from TLC, while sitting besides her husband. "It is difficult, but it's good because I know that good things are happening."

Anna shared that exciting news on Twitter, writing, "We are so excited to announce...we're pregnant! #4andCounting #BlessingfromTheLord @joshduggar #19Kids."

Josh and several other members of the Duggar family retweeted the happy announcement. The couple are already parents to three children: 5-year-old Mackynzie, 3-year-old Michael and 1-year-old Marcus.

The couple announced their pregnancy to the Duggar family shortly after Jessa Duggar and Ben Seewald tied the knot last month.

"After Ben and Jessa's wedding, we were still visiting with the family in Arkansas, and that was really exciting to get to share with the family the exciting news," Anna continued.

In August, Josh's younger sister Jill Duggar announced she was expecting her first child with husband Derick Dillard. In October, the couple announced that they were expecting a baby boy.